Already more than 3 years were gone, after Germany was united in 1990. Historian must survey historically german unification once more, after this german unification of Kohl was done.The subject of my study was to compare this german unification of Kohl with german unification of Hilter and german unification of Bismarck. Luckily in this 3 years I could have a chance to study in Germany and gather many materials for survey. I had already make public my studies and am going to publish another studies.1) Nazism and after2) National anthem of Germany and Austria3) Richar Wagner and German civil society4) German unification and male chorus movement5) German unification Plan of Herzog Ernst II